Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Number of prothallial cells present in male gametophyte of flowering plant is?

  1. Three

  2. Two

  3. One

  4. Zero
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Flowering plants (angiosperms) have a highly reduced male gametophyte that lacks prothallial cells entirely. This is a key difference from gymnosperms.

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Which one forms the male gametes in angiosperms?

  1. Antheridial cell

  2. Body cell

  3. Generative cell

  4. Tube cell
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the angiosperm male gametophyte, the generative cell undergoes mitosis to produce two male gametes (sperm cells).

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

As compared to oosphere, the male gamete of angiosperms is?

  1. Small

  2. With thin cytoplasm

  3. Nonvacuolate

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The male gamete in angiosperms is typically small, non-vacuolate, and contains a relatively thin cytoplasm compared to the large, nutrient-rich oosphere (egg cell). Since all these characteristics are accurate, the correct choice is all the above.

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Plants of this group are diploid and well adapted to extreme conditions.They grow bearing sporophylls in compact structures called cones. The group-in reference is

  1. monocots

  2. dicots

  3. pteridophytes

  4. gymnosperms
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The life cycle of gymnosperms have a dominant sporophyte and reduced gametophyte with the female gametophyte retained on the sporophyte. The male and female sex organs are formed in structures called cones or strobili. In gymnosperms both the sexes are separate. Meiosis occurs in both male and female strobili. 

So,the correct answer is "Gymnosperms ". 

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Number of gametes produced by a male gametophyte of flowering plant is?

  1. Four

  2. One

  3. Three

  4. Two
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In angiosperms, the mature male gametophyte (pollen grain) undergoes mitosis to produce two non-motile male gametes. These gametes are involved in double fertilization.

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Male gametophyte of angiosperms/ monocots is?

  1. Microsporangium

  2. Nucellus

  3. Microspore

  4. Stamen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The microspore is the first cell of the male gametophyte generation in angiosperms. It develops into the pollen grain, which constitutes the male gametophyte.

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Number of male gametes formed by $16$ microspore mother cells is?

  1. $128$
  2. $64$
  3. $32$
  4. $16$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Each microspore mother cell (MMC) undergoes meiosis to produce 4 microspores. Each microspore then develops into a pollen grain containing 2 male gametes. Thus, 16 MMC produce 16 * 4 = 64 microspores, which in turn produce 64 * 2 = 128 male gametes.

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Xenia and metaxenia are related to.

  1. Only endosperm

  2. Xylem and phloem

  3. Pollen and ednosperm

  4. Pollen culture
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Xenia refers to the effect of pollen on the endosperm, while metaxenia refers to the effect of pollen on maternal tissues outside the embryo sac. Both phenomena involve the influence of pollen on seed or fruit characteristics.

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

An angiospermic male plant with $24$ chromosomes in its pollen mother cells is crossed with female plant having $24$ chromosomes in its root cells. What would be chromosome number of embryo and endosperm respectively after the cross.

  1. $24$ and $48$
  2. $24$ and $24$
  3. $48$ and $72$
  4. $24$ and $36$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pollen mother cells are diploid (2n=24), so n=12. The embryo is formed by the fusion of a male gamete (n=12) and the egg (n=12), resulting in 2n=24. The endosperm is formed by the fusion of a male gamete (n=12) and two polar nuclei (n+n=24), resulting in 3n=36.

Multiple choice microsporophyll vs megasporophyll plant kingdom biology

Sporopollenin occurs in.

  1. Female gametophyte

  2. Male gametophyte

  3. Vegetative cells of pollen grain

  4. Exine of pollen wall
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sporopollenin is an extremely resistant organic polymer that forms the outer layer of the pollen wall, known as the exine.